Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of the first image in a sequence of a firstembodiment of a display screen or portion thereof with transitionalgraphical user interface, showing our new design;

FIG. 2 is a front view of the second image thereof;

FIG. 3 is a front view of the third image thereof;

FIG. 4 is a front view of the first image in a sequence of a secondembodiment of a display screen or portion thereof with transitionalgraphical user interface, showing our new design;

FIG. 5 is a front view of the second image thereof; and,

FIG. 6 is a front view of the third image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1 to 3 , between the images shown inFIGS. 4 to 6 , respectively. The process or period in which one imagetransitions to another forms no part of the claimed design.

The outer perimeters illustrated by broken lines in FIGS. 1-6 depict adisplay screen or portion thereof and forms no part of the claimeddesign. The remaining broken lines depict portions of the graphical userinterface that form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.